Box transformer substation dehumidification linkage system and method based on cooling air of fan frequency converter

Abstract

The invention belongs to the field of box-type transformer substation dehumidification, and discloses a box-type transformer substation dehumidification linkage system and method based on cooling air of a fan frequency converter, and the cooling air exhausted by the fan frequency converter is introduced into a high-voltage side compartment of a box-type transformer substation through a flow guide unit for dehumidification. The temperature and humidity data of the interior of the high-pressure chamber, the flow guide outlet and the heat dissipation opening are monitored in real time through the collecting unit, the control unit outputs a valve opening adjusting signal according to the collected data, and the valve control unit controls the valve opening according to the signal so as to switch a conventional mode or an enhanced dehumidification mode. The system makes full use of waste heat resources of the fan frequency converter, eliminates dependence of an extra power supply, and remarkably reduces energy consumption and operation and maintenance cost; the problems of replacement and waste of the chemical dehumidizer are avoided, and the environmental protection property is improved; the air duct design is optimized through intelligent linkage, the dehumidification efficiency is improved, moisture accumulation is restrained, and resource waste is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of box-type substation dehumidification, and in particular relates to a box-type substation dehumidification linkage system and method based on heat dissipation wind of a fan inverter. Background Art

[0002] In power systems, box-type substations, also known as box-type transformers, are key equipment for power conversion and distribution. The stability of their operating environment plays a vital role in the reliability of power supply. With the continuous development of the power industry, box-type substations are increasingly being used in a wide range of scenarios. However, moisture accumulation within box-type substations can easily lead to problems such as dampness in equipment and degradation of insulation performance. In severe cases, it can even cause power outages, impacting the safe and stable operation of the power system. Therefore, effectively addressing moisture accumulation within box-type substations has become a key research direction for ensuring the reliability of power supply.

[0003] However, current box-type substation dehumidification technology has many shortcomings that need to be addressed. Traditional methods mostly use electric heating or independent dehumidifiers. These methods require additional power supply and high energy consumption, which not only increases operation and maintenance costs but also causes energy waste. Some box-type substations use chemical dehumidifiers such as silica gel to absorb moisture, but these dehumidifiers need to be replaced regularly, which poses the risk of leakage and pollution during replacement, and the waste disposal is not environmentally friendly and does not conform to the development concept of green environmental protection. Most box-type substations on the market use natural ventilation or forced exhaust methods, which are not linked to the equipment's cooling system. This causes condensation to form when cold and hot air converge, exacerbating moisture accumulation. At the same time, the air duct design is unreasonable, resulting in poor dehumidification effect.

[0004] It can be seen that the existing box-type substation dehumidification technology has problems such as high energy consumption, poor environmental protection, low dehumidification efficiency and waste of resources. Summary of the Invention

[0005] The present invention provides a box-type substation dehumidification linkage system and method based on fan inverter heat dissipation wind, so as to solve the technical problems of existing box-type substation dehumidification technology such as high energy consumption, poor environmental protection, low dehumidification efficiency and resource waste.

[0006] In order to achieve the above object, the present invention adopts the following technical contents: A box-type transformer dehumidification linkage system based on fan inverter heat dissipation air, comprising: The diversion unit is installed between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type substation, and is used to supply the heat dissipation air discharged from the fan inverter to the box-type substation for dehumidification; The collection units are respectively installed inside the high-voltage room of the box-type substation, at the outlet of the guide unit and at the heat dissipation outlet of the fan inverter, and are used to collect the temperature and humidity inside the high-voltage room of the substation, at the outlet of the guide pipe and at the heat dissipation outlet of the fan inverter; The control unit is connected with the acquisition unit, and is used for outputting a valve opening degree adjusting signal according to the acquired temperature and humidity; The valve control unit is connected with the control unit, and is used for controlling the valve opening degree according to the valve opening degree adjusting signal, so that the box transformer dehumidification linkage system switches between the normal mode and the enhanced mode.

[0007] Further, the flow guide unit comprises a flow guide pipe and an air supply unit. The flow guide pipe is connected between the heat dissipation outlet of the fan frequency converter and the high-voltage side compartment of the box transformer substation. The air supply unit is arranged at an air supply port of the high-voltage side compartment of the box transformer substation, and is used for conveying the heat dissipation air in the flow guide pipe into the high-voltage side compartment of the box transformer substation. The valve control unit is installed in the flow guide pipe, and is used for controlling the flow of the heat dissipation air in the flow guide pipe through the valve.

[0008] Further, the flow guide pipe adopts a double-layer heat preservation structure, wherein the inner layer of the flow guide pipe adopts a stainless steel bellows, and the outer layer is covered with a polyurethane heat preservation layer.

[0009] Further, the air supply unit adopts an adjustable air distributor, which is arranged at the top of the high-voltage side compartment of the box transformer substation, and comprises an electric louver, which is used for uniformly covering the heat dissipation air on the insulators and the cable joints through the electric louver.

[0010] Further, a one-way air valve is arranged at the heat dissipation outlet of the fan frequency converter.

[0011] Further, the acquisition unit comprises a plurality of temperature and humidity sensors and an ultrasonic anemometer; one temperature and humidity sensor is arranged at the inside of the high-voltage compartment of the box transformer substation, the outlet of the flow guide unit and the heat dissipation port of the fan frequency converter; one temperature and humidity sensor is arranged outside the box transformer substation, and is used for monitoring the real-time environmental temperature and humidity; and the ultrasonic anemometer is installed in the flow guide unit, and is used for monitoring the real-time air supply flow.

[0012] Further, the control unit outputs the valve opening degree adjusting signal according to the acquired temperature and humidity of the inside of the high-voltage compartment of the box transformer substation, and specifically comprises: The temperature and humidity of the inside of the high-voltage compartment of the box transformer substation is compared with a preset relative humidity threshold value; if the temperature and humidity of the inside of the high-voltage compartment of the box transformer substation is less than or equal to the preset relative humidity threshold value, a normal valve opening degree adjusting signal is output; otherwise, an enhanced valve opening degree adjusting signal is output.

[0013] Further, if the temperature and humidity of the inside of the high-voltage compartment of the box transformer substation is less than or equal to the preset relative humidity threshold value, a normal valve opening degree adjusting signal is output; otherwise, an enhanced valve opening degree adjusting signal is output, and the method comprises: If the humidity inside the high-voltage room of the box-type substation is ≤60%RH, a conventional valve opening adjustment signal is output, and the conventional valve opening adjustment signal is used to control the valve to open 30% of the rated value; If the humidity inside the high-voltage room of the box-type substation is greater than 60% RH, an enhanced valve opening adjustment signal is output, and the enhanced valve opening adjustment signal is used to control the valve to open to 80% of the rated value; wherein RH represents relative humidity; The process in which the control unit outputs the valve opening adjustment signal according to the collected humidity inside the high-voltage chamber of the box-type substation also includes: The control unit outputs the valve opening adjustment signal based on the collected internal temperature of the high-voltage chamber of the box-type substation and the ambient temperature, specifically including: Based on the internal temperature of the high-voltage room of the box-type substation and the ambient temperature, the indoor and outdoor temperature difference is calculated; If the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, the enhanced valve opening adjustment signal is output.

[0014] Furthermore, the diversion unit includes a diversion pipe and a bypass pipe; The diversion pipe and the bypass pipe are both arranged between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type substation; wherein, the bypass pipe is connected to the high-voltage side compartment of the box-type substation through the transformer oil cooling system; The fan inverter heat dissipation outlet is equipped with a temperature sensor for real-time monitoring of the heat dissipation air temperature at the outlet; When the heat dissipation air temperature is greater than the first temperature threshold, the diversion pipe is connected to the high-voltage side compartment of the box-type substation; When the cooling air temperature is less than or equal to the first temperature threshold, the bypass pipe is connected to the transformer oil cooling system, and the transformer oil cooling system is connected to the high-voltage side compartment of the box-type substation. The transformer oil cooling system preheats the cooling air transported by the bypass pipe and transports the preheated cooling air to the high-voltage side compartment of the box-type substation.

[0015] A working method of a box-type transformer dehumidification linkage system based on fan inverter heat dissipation air, based on the above box-type transformer dehumidification linkage system based on fan inverter heat dissipation air, comprising: Use the diversion unit to supply the cooling air discharged from the fan inverter to the box-type substation for dehumidification; The temperature and humidity inside the substation high-voltage room, at the outlet of the diversion duct, and at the heat dissipation outlet of the fan inverter are collected through the collection unit; The control unit is used to output valve opening adjustment signals according to the collected temperature and humidity; The valve opening is controlled by the valve control unit according to the valve opening adjustment signal, so that the box-type transformer dehumidification linkage system can switch to normal mode or enhanced mode.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a box-type substation dehumidification linkage system based on the cooling air from a fan inverter. A diversion unit directs the cooling air discharged from the fan inverter into the high-voltage compartment of a box-type substation for dehumidification. A collection unit monitors real-time temperature and humidity data from the high-voltage compartment, the diversion outlet, and the heat dissipation outlet. A control unit outputs a valve opening adjustment signal based on the collected data, and a valve control unit controls the valve opening accordingly, switching between normal and enhanced dehumidification modes. Using temperature and humidity sensors to dynamically capture environmental changes, the control unit analyzes humidity differences and temperature gradients to derive optimized valve opening instructions, thereby precisely adjusting the flow and intensity of the cooling air flowing into the high-voltage compartment, achieving coordinated dehumidification and heat dissipation. In normal mode, the cooling air is moderately utilized for dehumidification, while in enhanced mode, the air volume is increased to offset condensation caused by the convergence of cold and hot air. This system fully utilizes the waste heat resources of the fan inverter, eliminates reliance on additional power supplies, and significantly reduces energy consumption and operation and maintenance costs. It also avoids the replacement and disposal of chemical dehumidifiers, improving environmental performance. Through intelligent linkage and optimized air duct design, it improves dehumidification efficiency, inhibits moisture accumulation, and reduces resource waste.

[0017] Preferably, in the present invention, the design of the guide duct and the air supply unit is combined with the flow control of the valve control unit to optimize the directional delivery of the heat dissipating air from the source to the target, avoid the uneven dehumidification phenomenon caused by the unreasonable design of the traditional air duct, and enhance the system reliability and resource utilization.

[0018] Preferably, in the present invention, the inner stainless steel bellows and the outer polyurethane insulation layer of the double-layer insulation structure effectively lock the heat of the cooling air, reduce the temperature loss and condensation risk during the transmission process, ensure the stability of the wind temperature, improve the dehumidification effect and system durability, and the stainless steel bellows have the characteristics of corrosion, which improves the service life of the diversion pipe.

[0019] Preferably, in the present invention, the adjustable air distributor is combined with the top installation method of the electric blinds to ensure that the heat dissipation air evenly covers key parts such as insulators and cable joints, eliminates local humidity hot spots, prevents equipment corrosion and condensation formation, and solves the problem of uneven coverage of traditional ventilation methods.

[0020] Preferably, in the present invention, the provision of a one-way air valve prevents external air from flowing back into the heat dissipation system, maintains the one-way flow and purity of the heat dissipation air, avoids pollution interference and energy waste, and improves the stability of system operation.

[0021] Preferably, in the present invention, the combination of multi-point temperature and humidity sensors and ultrasonic anemometers provides comprehensive environmental monitoring data, enabling the control unit to accurately capture humidity changes and wind flow dynamics, optimize valve control decisions, and improve the accuracy and efficiency of dehumidification response.

[0022] Preferably, in the present invention, a valve signal is output based on an intelligent comparison between the humidity inside the high-pressure chamber and a preset threshold value to achieve automatic mode switching, ensure that the dehumidification intensity matches the actual humidity demand in real time, avoid excessive or insufficient dehumidification, and improve system energy efficiency.

[0023] Preferably, in the present invention, the logic expansion of humidity comparison and indoor and outdoor temperature difference calculation is combined to strengthen the active identification of condensation risk, timely trigger the enhanced mode to offset the effect of cold and hot wind convergence, and effectively prevent moisture accumulation and resource waste.

[0024] Preferably, in the present invention, the system is also designed with a waste heat cascade utilization mechanism. When the heat dissipation air temperature is greater than the first temperature threshold, the diversion pipe is preferentially connected to the high-voltage side compartment of the box-type substation, thereby meeting the demand for immediate dehumidification; when the heat dissipation air temperature is less than or equal to the first temperature threshold, the medium-temperature air is led to the transformer oil cooling system through the bypass pipe for preheating, thereby ensuring the dehumidification effect and maximum energy utilization.

[0025] The present invention also provides a working method for a box-type transformer dehumidification linkage system based on the heat dissipation air of a fan inverter. Based on the above-mentioned box-type transformer dehumidification linkage system based on the heat dissipation air of a fan inverter, this method introduces the heat dissipation air discharged by the fan inverter into the high-pressure chamber for dehumidification through a diversion unit, and uses a collection unit to monitor the temperature and humidity of three places in the high-pressure chamber, the diversion outlet, and the heat dissipation outlet in real time. The control unit analyzes the data and outputs a valve opening adjustment signal, and the valve control unit dynamically switches between conventional and enhanced dehumidification modes accordingly. This method is based on differential analysis of multi-point temperature and humidity data, and the control unit intelligently derives the valve opening instruction - when the humidity in the high-pressure chamber rises or there is a risk of condensation due to the intersection of cold and hot, the valve opening is increased to enter the enhanced mode to increase the dehumidification air volume; otherwise, the conventional mode is maintained for moderate dehumidification, thereby actively avoiding condensation and optimizing resource utilization. This method achieves deep synergy between the dehumidification and heat dissipation systems, directly utilizes the equipment's waste heat resources to avoid the additional energy consumption of independent dehumidification, and eliminates the risk of contamination from chemical dehumidifiers. By dynamically matching air volume and humidity requirements, it effectively suppresses moisture accumulation, solving the core defects of traditional ventilation methods, such as rigid duct design and low dehumidification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the overall structure of a box-type transformer dehumidification linkage system based on fan inverter heat dissipation wind provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of an application of a box-type transformer dehumidification linkage system based on a fan inverter heat dissipation wind provided by an embodiment of the present invention; Figure 3 A flowchart of the working method of a box-type transformer dehumidification linkage system based on fan inverter heat dissipation wind is provided in an embodiment of the present invention.

[0027] Reference numerals: 1. Fan inverter; 2. Box-type substation; 3. Diversion duct. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The present invention provides a box-type transformer dehumidification linkage system based on the heat dissipation air of a fan inverter, which specifically includes: a diversion unit, which is installed between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type transformer station, and is used to supply the heat dissipation air discharged by the fan inverter to the box-type transformer station for dehumidification; a collection unit, which is respectively arranged in the high-voltage room of the box-type transformer station, the outlet of the diversion unit and the heat dissipation outlet of the fan inverter, and is used to collect the temperature and humidity inside the high-voltage room of the transformer station, the outlet of the diversion pipe and the heat dissipation outlet of the fan inverter; a control unit, which is connected to the collection unit and is used to output a valve opening adjustment signal according to the collected temperature and humidity; a valve control unit, which is connected to the control unit and is used to control the valve opening according to the valve opening adjustment signal, so that the box-type transformer dehumidification linkage system can switch to normal mode or enhanced mode.

[0034] The following is a further explanation of the dehumidification linkage system provided by the invention with reference to the accompanying drawings and embodiments: Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a box-type transformer dehumidification linkage system based on the heat dissipation wind of the fan inverter, including: a guide unit, a collection unit, a control unit and a valve control unit, wherein: the guide unit includes a guide duct 3 and an air supply unit. The guide duct 3 connects the heat dissipation outlet of the fan inverter 1 and the high-voltage side compartment of the box-type transformer substation 2, and adopts a double-layer insulation structure: the inner layer is a stainless steel bellows with anti-corrosion performance, and the outer layer is covered with a polyurethane insulation layer to reduce heat loss and prevent condensation. The air supply unit is an adjustable air distributor, which is arranged at the top of the high-voltage side compartment and includes electric shutters, which can evenly guide the heat dissipation air to key components such as insulators and cable connectors. A one-way air valve is provided at the heat dissipation outlet of the fan inverter to prevent backflow of air.

[0035] The acquisition unit includes multiple temperature and humidity sensors and ultrasonic anemometers: a temperature and humidity sensor inside the high-voltage chamber, installed in the high-voltage side compartment, to monitor the ambient temperature and humidity; a temperature and humidity sensor at the outlet of the diversion duct, to monitor the supply air temperature and humidity; a temperature and humidity sensor at the heat dissipation outlet of the fan inverter, to monitor the heat source temperature; a temperature and humidity sensor outside the box transformer, installed on the box transformer casing, to obtain environmental parameters; and an ultrasonic anemometer, installed in the diversion duct, to monitor the real-time supply air flow.

[0036] The control unit receives data from the acquisition unit and outputs a valve opening adjustment signal based on preset logic. The valve control unit is an electric regulating valve installed in the diversion pipe. It adjusts the valve opening according to the control signal to control the cooling air flow.

[0037] For example, the specific working principle and mode switching of this dehumidification linkage system are as follows: Normal mode (humidity ≤ 60% RH): When the humidity inside the high-pressure chamber is ≤60%RH, the control unit outputs a normal valve opening adjustment signal, and the valve opens to 30% of the rated value. At this time, the cooling air is evenly delivered into the high-pressure chamber through the guide pipe and adjustable air distributor, maintaining a dry environment indoors.

[0038] Enhanced mode (humidity > 60% RH or indoor and outdoor temperature difference > 5°C): If the humidity is greater than 60% RH, the valve opens to 80% of the rated value, increasing the cooling air flow and rapidly reducing the humidity; RH represents relative humidity.

[0039] If the temperature difference between indoor and outdoor is greater than 5°C (preset threshold), even if the humidity does not exceed the standard, the enhanced mode will be triggered to prevent condensation caused by the temperature difference.

[0040] Example 2 This embodiment further provides a box-type transformer dehumidification linkage system with a waste heat cascade utilization mechanism. This embodiment adds a waste heat cascade utilization mechanism on the basis of Example 1, and is suitable for scenarios where the heat dissipation air temperature fluctuates greatly.

[0041] For example, a bypass duct is added to the diversion unit and connected in parallel with diversion duct 3. The bypass duct is connected to the high-voltage side compartment through the transformer oil cooling system. A temperature sensor is installed at the fan inverter heat dissipation outlet to monitor the cooling air temperature in real time.

[0042] When the cooling air temperature is greater than 40°C (the first temperature threshold), the guide pipe 3 is opened and the cooling air is directly sent into the high-pressure chamber; When the cooling air temperature is ≤40℃, the bypass pipe is opened, and the cooling air is preheated by the transformer oil cooling system (using the heat from the transformer operation) before being sent into the high-voltage chamber to avoid condensation caused by low-temperature airflow.

[0043] In this embodiment, the control unit first selects a conduction path according to the heat dissipation air temperature: If the temperature reaches the standard, the humidity-temperature difference logic switching mode is performed according to Example 1; If the temperature does not meet the standard, the bypass preheating channel is activated and the valve opening is adjusted based on the humidity data.

[0044] It can be seen that in the embodiment, when the heat dissipation air temperature is greater than the first temperature threshold, the guide pipe 3 is preferentially connected to the high-voltage side compartment of the box-type substation 2, thereby meeting the demand for immediate dehumidification; when the heat dissipation air temperature is less than or equal to the first temperature threshold, the medium-temperature air is led to the transformer oil cooling system for preheating through the bypass pipe, and then the preheated high-temperature air is transported to the high-voltage side compartment of the box-type substation 2 through the transformer oil cooling system for preheating, thereby ensuring the dehumidification effect and the maximum utilization of energy.

[0045] In this embodiment, the adjustable air distributor automatically adjusts the angle of the motorized louvers based on the air supply temperature and flow rate, ensuring that the preheated air evenly covers key components such as insulators and cable connectors. When humidity drops to a safe range and the temperature differential is minimal, the system automatically switches to normal mode, achieving energy-saving operation.

[0046] Example 3 This embodiment provides a box-type substation dehumidification linkage system, which addresses the long-standing high humidity erosion problem faced by box-type substations in coastal areas. It achieves efficient dehumidification by recycling waste heat from fan inverters. The specific implementation is as follows: The guide unit is used as a bridge to connect the fan inverter and the high-voltage side compartment of the box-type transformer, and contains dual functional components: The diversion duct 3 features a double-layer insulation design. The inner layer is a stainless steel bellows, designed to withstand the long-term high-temperature impact of the inverter cooling airflow. It is flexible enough for complex installation environments and corrosion-resistant. The outer layer is covered with a 5mm thick polyurethane insulation layer (thermal conductivity ≤ 0.024W / (m·K)). At an ambient temperature of 25°C and a cooling air temperature of 50°C, the temperature drop at the end of the duct does not exceed 3°C. The inner diameter of the duct is designed according to the rated cooling airflow of the inverter. The typical configuration is DN200, ensuring an air velocity range of 8-10m / s. This prevents pressure loss caused by excessive flow velocity and condensation caused by low flow velocity.

[0047] The air supply unit includes an adjustable air distributor mounted on the top of the high-voltage compartment. It features integrated motorized shutters (blade angle adjustable from 0-90°, response time ≤5s). Through simulation-optimized design, this unit provides uniform airflow coverage over insulators (creepage distance ≥31mm / kV) and cable connectors (contact resistance ≤50μΩ), achieving a measured air supply uniformity of ≥92%. A deflector is installed at the air distributor outlet, creating a 30° air supply angle to prevent direct airflow to the high-voltage busbar, which could cause local overheating.

[0048] This system installs a one-way air valve (opening pressure ≤ 50Pa) at the heat dissipation outlet of the inverter to prevent the backflow of high-pressure air in the box transformer and affect the heat dissipation efficiency of the inverter; a condensate collection tank is set at the lowest point of the pipeline and connected to the external drainage hole of the box transformer to prevent water accumulation from corroding the pipeline.

[0049] The system also includes: The acquisition unit includes seven monitoring devices distributed at key nodes of the system, building a multi-dimensional data acquisition network, as follows: The temperature and humidity sensors are installed in the following locations: Inside the high-voltage chamber: Using SHT30 chip, with a measurement accuracy of ±1.5%RH (at 25°C), installed 20cm above the cable connector to avoid equipment obstruction; At the outlet of the diversion duct: An integrated temperature compensation module is used to calibrate the supply air temperature and humidity in real time, installed 10cm in front of the air distributor inlet; At the heat dissipation outlet of the inverter: A high-temperature resistant sensor (temperature resistant to 120°C) is embedded 5cm inside the heat dissipation grille of the inverter; Outside the box transformer: IP65 protection grade, installed on the north side of the box (avoiding direct sunlight), monitoring the ambient temperature, humidity and atmospheric pressure.

[0050] The collection unit also includes an ultrasonic anemometer, which uses the time difference method and is installed in the straight section of the diversion pipe (≥5 times the pipe diameter from the elbow). The measurement accuracy is ±2%, and the air supply flow is fed back in real time to provide dynamic data support for valve adjustment.

[0051] Regarding the measurement of ultrasonic anemometers: ultrasonic anemometers are embedded in the diversion duct to monitor the actual air volume and feed it back to the control system. In the specific implementation process, the fan and diversion duct: according to the existing fan inverter heat dissipation fan has a high temperature resistance (operating temperature ≤ 120 ° C), and the air volume range is 500-2000m 3 , meeting the conditions for transporting dry air to the box-type substation using the guide pipe.

[0052] The system also includes: a control unit and a valve control unit, specifically including: The control module developed based on the STM32H7 chip has a built-in fuzzy PID algorithm to achieve multi-parameter coupling control. The specific threshold control logic is as follows: First, the normal mode triggering conditions: the humidity in the high-pressure chamber is ≤60%RH and the temperature difference between indoor and outdoor is ≤5℃, and a 30% valve opening signal is output to maintain the basic dehumidification capacity (about 150 m 3 / h).

[0053] Second, the enhanced mode triggering conditions: any of the following conditions are met: (1) Humidity > 60% RH (typical values ​​in coastal areas during the rainy season can reach 85% RH); (2) Indoor and outdoor temperature difference > 5°C (a large temperature difference between day and night can easily cause condensation). At this time, the valve opening is increased to 80%, and the air flow rate is increased to 400m 3 / h, with the electric blinds fully opened, rapid dehumidification can be achieved.

[0054] For example, this embodiment also provides a temperature and humidity linkage control algorithm for the control unit: The system has preset modes: normal, enhanced, and energy-saving. When the humidity inside the high-voltage chamber of a box-type substation is ≤55%RH, the system enters energy-saving mode, with the diversion duct damper opening 20% ​​and the fan inverter cooling fan running at a lower speed. This ensures basic dehumidification while further reducing energy consumption.

[0055] When the humidity inside the high-voltage chamber of the box-type substation is between 55%RH-60%RH, the system is in the normal mode, the guide duct air valve is opened by 30%, and the fan frequency converter cooling fan operates at a normal speed.

[0056] When the humidity inside the high-voltage chamber of the box-type substation is >60%RH or the temperature difference between the inside and outside of the box-type substation is >10°C, the system automatically switches to the enhanced mode, the fan frequency converter fan speed is increased to 85% of the rated value, the guide duct air valve is fully opened, and the delivery amount of dry air is increased.

[0057] For example, the valve control unit selects a pneumatic diaphragm regulating valve (nominal pressure PN16) matched with a Siemens positioner (accuracy ±0.5%) with a response time ≤3s. The valve has a built-in pressure sensor that provides real-time feedback of the pipeline static pressure to prevent overpressure damage to the air distributor.

[0058] As shown in Figure 3 The box-type substation dehumidification linkage system based on the fan frequency converter cooling air provided in the above embodiment has the following specific working process: The fan frequency converter cooling air is supplied to the box-type substation for dehumidification by the guide unit; The temperature and humidity inside the high-voltage chamber of the substation, at the outlet of the guide duct, and at the fan frequency converter cooling port are collected by the collection unit; The control unit outputs a valve opening adjustment signal according to the collected temperature and humidity; The valve opening adjustment signal is used by the valve control unit to control the valve opening, so that the box-type substation dehumidification linkage system switches between the normal mode and the enhanced mode.

[0059] Therefore, the box-type substation dehumidification linkage system and method based on the fan frequency converter cooling air have the following advantages: First, energy saving: the invention uses the waste fan frequency converter cooling air to dehumidify the matched box-type substation, which has a significant energy saving effect compared to the traditional electric heating dehumidification of the box-type substation. Through estimation, a large amount of operating cost can be saved.

[0060] Second, environmental protection and safety: the invention is a complete physical dehumidification method that avoids chemical reagent pollution, is environmentally friendly and safe, and meets the green environmental protection requirements.

[0061] Third, high dehumidification efficiency: the dry air directly acts on the internal space of the high-voltage side of the box-type substation, and under the action of the high-temperature dry air of the fan frequency converter, the humidity inside the box-type substation can be stably controlled below 55%RH, achieving high dehumidification efficiency.

[0062] Fourth, strong system reliability: through the increased ventilation duct, air valve anti-backflow design, and multiple sensor redundant monitoring, the long-term operation of the system is ensured without failure.

[0063] Fifth, strong adaptability: it can adapt to wind turbine inverters and box-type substation models of different power levels. The renovation project is small and only the diversion pipes and control systems need to be installed.

[0064] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A box-type transformer dehumidification linkage system based on fan inverter heat dissipation wind, characterized in that: include: The diversion unit is installed between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type substation, and is used to supply the heat dissipation air discharged from the fan inverter to the box-type substation for dehumidification; The collection units are respectively installed inside the high-voltage room of the box-type substation, at the outlet of the guide unit and at the heat dissipation outlet of the fan inverter, and are used to collect the temperature and humidity inside the high-voltage room of the substation, at the outlet of the guide pipe and at the heat dissipation outlet of the fan inverter; The control unit is connected to the acquisition unit and is used to output a valve opening adjustment signal according to the collected temperature and humidity; The valve control unit is connected to the control unit and is used to control the valve opening according to the valve opening adjustment signal so that the box-type transformer dehumidification linkage system can switch to normal mode or enhanced mode.

2. The box-type transformer dehumidification linkage system based on the heat dissipation wind of the fan inverter according to claim 1 is characterized in that: The guide unit includes a guide pipe and an air supply unit; The guide pipe is connected between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type substation; The air supply unit is arranged at the air supply port of the high-voltage side compartment of the box-type substation, and is used to transport the heat dissipation air in the guide pipe to the high-voltage side compartment of the box-type substation; The valve control unit is installed in the guide pipe and is used to control the flow rate of the heat dissipation air in the guide pipe through the valve.

3. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 2 is characterized in that: The diversion pipe adopts a double-layer insulation structure, wherein the inner layer of the diversion pipe adopts a stainless steel bellows and the outer layer is covered with a polyurethane insulation layer.

4. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 2 is characterized in that: The air supply unit adopts an adjustable air divider, which is arranged on the top of the high-voltage side compartment of the box-type substation. The adjustable air divider includes electric shutters for evenly covering the insulators and cable joints with heat dissipation air through the electric shutters.

5. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 2 is characterized in that: A one-way air valve is provided at the heat dissipation outlet of the fan inverter.

6. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 1 is characterized in that: The collection unit includes multiple temperature and humidity sensors and an ultrasonic anemometer; a temperature and humidity sensor is installed inside the high-voltage room of the box-type substation, at the outlet of the diversion unit, and at the heat dissipation outlet of the fan inverter; a temperature and humidity sensor is installed outside the box-type substation for real-time monitoring of the ambient temperature and humidity; the ultrasonic anemometer is installed inside the diversion unit for monitoring the real-time air supply flow.

7. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 1 is characterized in that: The control unit outputs a valve opening adjustment signal according to the collected humidity inside the high-voltage chamber of the box-type substation, specifically including: The humidity inside the high-voltage chamber of the box-type substation is compared with the preset relative humidity threshold. If the humidity inside the high-voltage chamber of the box-type substation is less than or equal to the preset relative humidity threshold, a conventional valve opening adjustment signal is output; otherwise, an enhanced valve opening adjustment signal is output.

8. The box-type transformer dehumidification linkage system based on the heat dissipation wind of the fan inverter according to claim 7 is characterized in that: If the humidity inside the high-voltage room of the box-type substation is less than or equal to the preset relative humidity threshold, a conventional valve opening adjustment signal is output; Otherwise, the output strengthens the valve opening adjustment signal, including: If the humidity inside the high-voltage room of the box-type substation is ≤60%RH, a conventional valve opening adjustment signal is output, and the conventional valve opening adjustment signal is used to control the valve to open 30% of the rated value; If the humidity inside the high-voltage room of the box-type substation is greater than 60% RH, an enhanced valve opening adjustment signal is output, and the enhanced valve opening adjustment signal is used to control the valve to open to 80% of the rated value; wherein RH represents relative humidity; The process in which the control unit outputs the valve opening adjustment signal according to the collected humidity inside the high-voltage chamber of the box-type substation also includes: The control unit outputs the valve opening adjustment signal based on the collected internal temperature of the high-voltage chamber of the box-type substation and the ambient temperature, specifically including: Based on the internal temperature of the high-voltage room of the box-type substation and the ambient temperature, the indoor and outdoor temperature difference is calculated; If the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, the enhanced valve opening adjustment signal is output.

9. The box-type transformer dehumidification linkage system based on fan inverter heat dissipation air according to claim 1 is characterized in that: The diversion unit includes a diversion pipe and a bypass pipe; The diversion pipe and the bypass pipe are both arranged between the heat dissipation outlet of the fan inverter and the high-voltage side compartment of the box-type substation; wherein, the bypass pipe is connected to the high-voltage side compartment of the box-type substation through the transformer oil cooling system; The fan inverter heat dissipation outlet is equipped with a temperature sensor for real-time monitoring of the heat dissipation air temperature at the outlet; When the heat dissipation air temperature is greater than the first temperature threshold, the diversion pipe is connected to the high-voltage side compartment of the box-type substation; When the cooling air temperature is less than or equal to the first temperature threshold, the bypass pipe is connected to the transformer oil cooling system, and the transformer oil cooling system is connected to the high-voltage side compartment of the box-type substation. The transformer oil cooling system preheats the cooling air transported by the bypass pipe and transports the preheated cooling air to the high-voltage side compartment of the box-type substation.

10. A working method of a box-type transformer dehumidification linkage system based on heat dissipation of fan inverter, characterized in that: The box-type transformer dehumidification linkage system based on the heat dissipation wind of the fan inverter according to any one of claims 1 to 9 comprises: Use the diversion unit to supply the cooling air discharged from the fan inverter to the box-type substation for dehumidification; The temperature and humidity inside the substation high-voltage room, at the outlet of the diversion duct, and at the heat dissipation outlet of the fan inverter are collected through the collection unit; The control unit is used to output valve opening adjustment signals according to the collected temperature and humidity; The valve opening is controlled by the valve control unit according to the valve opening adjustment signal, so that the box-type transformer dehumidification linkage system can switch to normal mode or enhanced mode.

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